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minimum/maximum field in ip address

hello this post is regarding two queries related to ip address......
1).i already have a form in xml program as a dtd file......i have to enter the ip address in the form it comes as one single tab while i want it to be divided into 4 tabs as the ip address is entered for ex:172.16.254.1 so i want differnt tab for 172 and when i complete entering 172 it should automatically jump to the next section i.e. for entering 16 and so on........i also want this field of ip address to be shown as required...
2).The second part of my query is that the tabs that will be incorporated should have a defined limit such that if someone tries to enter the address that is out of range it should give a error message....